Introduction to Radiology Flashcards Preview

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Flashcards in Introduction to Radiology Deck (15):
1

radiology

a field of medicine devoted to creating images of patients for diagnosis & treatment

residency training lasts 4 years, plus a preliminary medicine year

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types of medical images:
non-visible radiation

the realm of radiology - xrays, magnetic fields, sound waves, nuclear particles, etc.

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what a radiologist does

supervises the acquisition of medical images & interprets the results of these studies

use imaging techniques to treat patients

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modality

a means of obtaining radiographic images

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modalities:
conventional radiographs:

aka ___

obtained by ___

___ absorb a lot of photons, whereas ___ absorbs few

traditionally displayed w/ ___ objects appearing ___

x-rays or "plain films"

shining high-energy photons through a patient & measuring how they're absorbed by the patient's tissues

dense objects such as bones, air in the lungs (ex.)

dense, white

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modalities:
conventional radiographs:

the direction that the photons travel through the patient determines ___

most commonly, we use ___ & ___ orientations

sometimes, objects lying on top of or near patients will ___, called ___

___ is the most frequent culprit

what the resulting image will look like

frontal (front-to-back), lateral (side-to-side)

absorb some of the photons & interfere w/ our image, "artifact" interference

metal

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modalities:
computed tomography (CT):

a technique derived from ___

instead of shining photons from one side of the patient to the other, CT ___ & uses that information to determine ___

the resulting images look as though the patient has been ___

conventional radiographs

shines photons from all different angles, how dense the tissue is at each point in the body

sliced horizontally into a stack of thin sections

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modalities:
computed tomography (CT):

we often manipulate the ___ of certain anatomic structures by administering ___ (___) to the patient

different means of administering ___, & different types of ___, can be combined to enhance the visualization of various anatomic structures

density, dense substances ("contrast agents")

contrast, contrast

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modalities:

the radiation used in x-rays & in CT is ___ & can cause ___

dangerous, cnacer

10

modalities:
magnetic resonance imaging (MRI):

patients are placed into a ___ & their ___ align with the ___

then, the patient is bombarded w/ ___ to knock the ___ out of alignment, & we measure how long it takes them to ___

strong magnetic field, hydrogen nuclei, field

electromagnetic radiation, hydrogen nuclei, return to alignment

11

modalities:
magnetic resonance imaging (MRI):

much more ___ than CT, & it provides a lot more ___ at substantially greater ___

it's also harder to ___

versatile, information, cost

interpret

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modalities:
fluoroscopy:

uses a continuous stream of ___ to produce an ___

although the images are less ___ than an x-ray, the additional information gained from sequential images can be ___

this technique is useful for structures that ___

radiation, x-ray movie

crisp & clear, very important

move unpredictably

13

modalities:
ultrasound:

uses ___ to produce images

these are bounced off of the patient's ___, & the ___ are used to construct images

ultrasound is very popular in other countries b/c its ___ relative to other modalities, but the images are ___

it has specific uses in areas where other modalities are ___

sound waves

tissues, echoes

inexpensive, less appealing to the eye

inexact

14

modalities:
nuclear medicine:

different form other modalities b/c it measures ___, not ___

radioactive molecules that are chemically similar to ___ are given to the patient

the radioactivity is used to make an image that shows where the ___ are accumulating in the body

physiology, anatomy

normal blood elements

radioactive molecules

15

modalities:
angiography:

a form of ___ in which ___ material ("___") is injected directly into blood vessels

we obtain images over ___ to watch how the blood is ___, & to create images of the insides of the vessels

the most ___ of the modalities b/c it requires that a ___ (a long plastic tube) be positioned inside the blood vessels

fluoroscopy, dense, contrast

time, flowing

invasive, catheter

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